Jason R. Masoner, David S. Burden, and Tom E. Short2002Digital Geologic Map of Sherman Quadrangle, North-Central Texas1.0vector digital dataOpen-file Report02-264Reston, VIrginiaU.S. Geological Surveyhttps://water.usgs.gov/lookup/getspatial?geologyMasoner, Jason R.; Burden, David S.; Short, Tom E.2002Digital geologic map of Sherman quadrangle, north central Texas
http://pubs.er.usgs.gov/publication/ofr02264This digital data set contains geologic formations for the 1:250,000-scale Sherman quadrangle, Texas and Oklahoma. The original data are from the Bureau of Economic Geology publication, "Geologic Atlas of Texas, Sherman sheet", by J.H. McGowen, T.F. Hentz, D.E. Owen, M.K. Pieper, C.A. Shelby, and V.E. Barnes, 1967, revised 1991.This data set was created for use in a regional ground-water model of the Lake Texoma watershed for a project by the U.S. Environmental Protection Agency, National Risk Management Research Laboratory located in Ada, Oklahoma, titled "Development of protocols and decision support tools for assessing watershed system assimilative capacity, in support of risked-based ecosystem management and restoration practices."
Although this data set was created for use in a specific project, it may be used to make geologic maps, and determine approximate areas and locations of various geologic units.
The file "/stratig.pdf" provides detailed descriptions of the stratigraphic nomenclature used in this data set.
Additional geology data sets are available for Oklahoma at URL http://ok.water.usgs.gov/public/gis/geology/index.html. The source maps for three counties in the Oklahoma panhandle are at a scale of 1:125,000. The source maps for the rest of Oklahoma are at a scale of 1:250,000.
The original geology source map was published in the Transverse Mercator Projection, Zone 14. This data set was projected to an Albers Equal Area projection (Synder, 1987), cast on the North American Datum of 1983.
This electronic report was subjected to the same review standard that applies to all U.S. Geological Survey reports. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. Reviewers were given digital data sets and paper plots for checking against the source maps to verify the linework and attributes. The reviewers were asked to check the metadata and accompanying files for completeness and accuracy.
References Cited:
Environmental Systems Research Institute, Inc. (ESRI), 2000, ARC/INFO Command References, ARC/INFO Version 7.1 ArcDoc: Redlands, CA. [online documentation].
McGowen, J.H., Hentz, T.F., Owen, D.E., Pieper, M.K., Shelby, C.A., and Barnes, V.E., (1991), Geologic Atlas of Texas, Sherman sheet, North-Central Texas, South-Central Oklahoma, revised: Bureau of Economic Geology, scale 1:250,000
Snyder, J.P., 1987, Map projections--A working manual: U.S. Geological Survey Professional Paper 1395, 383 p.
1967 revised 1991publication dateIn workNone planned-98.025946-95.99988834.01736932.982604NoneGeologyShermanGeologic formationsGeologic unitTexasOklahomaGeologic faultsFaultsinlandWatersNone.There is uncertainity in the position of geologic contacts from the field mapping process, the original map preparation, and the scanning process. Due to the absence of boundaries of some water bodies being absent from the original geologic map and therefore added to the data set by scanning the paper map, some misalignment may occur between boundaries of water bodies and geologic contacts. It may be inappropriate to use this data set at scales larger than 1:250,000.Jason R. MasonerU.S. Geological SurveyHydrologistmailing address202 NW 66th St., Bldg. 7Oklahoma CityOK73116USA1-888-275-8747405-843-7712jmasoner@usgs.govPlease use email.https://water.usgs.gov/GIS/browse/geology_texas.jpgIllustration of data set.jpgCompilation of this data set and associated metadata was funded under an Interagency Agreement between the U.S. Environmental Protection Agency, National Risk Management Laboratory, and the U.S. Geological Survey.
Resource Analysis and Mapping with Oklahoma State University scanned the original geologic contact prints.
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.1.1.649Polygon and chain-node topology present.This data set includes surficial geology for the Sherman 1:250,000-scale quadrangle.250,000mapThe original geologic formation contact map was provided by the Bureau of Economic Geology in Austin, Texas, and duplicated on a velox photographic print. The print was scanned using a ANATech 3640 Eagle optical scanner at a four hundred dots per inch resolution. The resulting image was imported into LTPlus, a enhanced software package designed to replace the line Trace System at the USDA-FS, where it was registered and edited as a raster image. The raster image was converted to a DLG3 vector (polygon) data set and imported in GRASS GIS software to inspect polygon topology and identify errors or problem areas. Corrections were made to the original raster image in LTPlus based upon errors identified in GRASS. The raster image was converted to a vector polygon format and manual attributing was performed. The data set was exported to DLG3 format and imported into ARC/INFO version 7.1.
Because the original geology negative lacked about a dozen small water bodies, the process from scanning to LTPlus to GRASS to ARC/INFO was repeated using the 1:250,000-scale Sherman published paper map in order to capture these missing water bodies. The two data sets were merged together using the UNION command (ESRI, ver. 7.1). Further editing was implemented using ARCEDITto improve overall quality of the geology data set. Types of edits performed were corrections of dangles or pseudo nodes within polygons and removal of unnecessary arcs and label errors.
The original geology negative and the published map were in the Transverse Mercator Projection, Zone 14, and was cast on the North American Datum of 1927. This geology data set was projected to an Albers Equal Area projection (Synder, 1987), cast on the North American Datum of 1983.
VectorComplete chain5381Label point2353GT-polygon composed of chains2353Point4Albers Conical Equal Area29.50000045.500000-96.00000023.0000000.0000000.000000coordinate pair0.0005120.000512metersNorth American Datum of 1983Geodetic Reference System 806378137.000000298.257222geology.aatArc feature attribute tableFIDInternal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeFeature geometry.ESRICoordinates defining the features.FNODE#Internal number of from-nodeComputedWhole numbers that are automatically generated.TNODE#Internal number of to-nodeComputedWhole numbers that are automatically generated.LPOLY#Internal number of polygon to left of arcComputedWhole numbers that are automatically generated.RPOLY#Internal number of polygon to right of arcComputedWhole numbers that are automatically generated.LENGTHLength of arc in data set unitsComputedPositive real numbers that are automatically generated.GEOLOGY#Internal feature numberComputedSequential unique whole numbers that are automatically generated.GEOLOGY-IDUser-assigned feature numberUser-assigned numbergeology.patPolygon feature attribute tableFIDInternal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeFeature geometry.ESRICoordinates defining the features.AREAArea of polygon in square data set unitsComputedPositive real numbers that are automatically generated.PERIMETERPerimeter of polygon in data set unitsComputedPositive real numbers that are automatically generated.GEOLOGY#Internal feature numberComputedSequential unique whole numbers that are automatically generated.GEOLOGY-IDUser-assigned feature numberUser-assigned numberIDNumber representing geologic formationUser-assigned number1 - 110unspecifiedunspecifiedCODEGeologic formation from source mapGeologic Atlas of Texas, Sherman sheetFORMATIONGeologic formation description from source mapGeologic Atlas of Texas, Sherman sheetTwo items of significance in this data set are the "Code" item and the "Formation" item. The "Code" item contains an ASCII character approximation of the map symbol for the name of the geologic unit or geologic formation. The "Formation" item contains an ASCII character approximation of the map stratigraphic nomenclature of the geologic unit or geologic formation.
The file stratigraphic.pdf conains a detailed listing of the stratigrphic nomenclature for this dataset.
U.S. Geological SurveyAsk USGS - Water Webserver Teammailing445 National CenterRestonVA201921-888-275-8747 (1-888-ASK-USGS)https://water.usgs.gov/user_feedback_form.htmlAlthough this data set has been used by the U.S. Geological
Survey, U.S. Department of the Interior, no warranty expressed or
implied is made by the U.S. Geological Survey as to the accuracy
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the U.S. Geological Survey in the use of this data, software, or
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Any use of trade, product, or firm names is for descriptive
purposes only and does not imply endorsement by the U.S.
Government.ExportFull coveragezipped1https://water.usgs.gov/GIS/dsdl/geology.e00.gzNone. This dataset is provided by USGS as a public service.20041108U.S. Geological SurveyAsk USGS -- Water Webserver Teammailing445 National CenterRestonVA201921-888-275-8747 (1-888-ASK-USGS)https://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+geologyFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998